Fix the menus

[atsb]

Get the main menu functioning and looking normal

[atsb]

It definitely doesn't help that we don't have the original DOOM3 code from 2004 (the non-steam version) but only the version from 2011 (after STEAM support and EAX were added). In short, it is incredibly difficult to deduce how the code is meant to be, for a non-steam version when all the paths and code are purely made to deal with the steam version's pak files.

This will take some time, and I don't say that lightly. I wonder why ID never released the original code... oh well.

But still, getting the menu to work with the STEAM version is a priority as I am guessing most players will have the steam version rather than the original box release.